Reflection: Grappling with Complexity Applying The Basics! - Section 4: Wrapping it Up!

 

I noticed some of my students did not realize the repeated strategies used when adding and subtracting numbers, such as counting forward, counting backwards, looking for tens, and identifying the greater number. When some students used base-ten blocks, they added the larger pieces first. I want students to know that it is not necessary to always start in the ones place when adding. They can add the tens and then the ones and regroup only when necessary. I allowed students time to practice this, and I pointed out that this will help them become familiar with estimating their answers later on. As students worked on adding the tens place first, I reminded them to check to see if regrouping was necessary first. I further explained that adding or subtracting the digits in the largest place value will help them estimate sums and differences to check the reasonableness of their answers.

  What I noticed!
  Grappling with Complexity: What I noticed!
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Applying The Basics!

Unit 1: Numbers & Operation in Base Ten Grade 2
Lesson 3 of 10

Objective: Students will fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Big Idea: Using base-ten materials and place-value skills, students gain a better understanding of how to add and subtract numbers.

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28 teachers like this lesson
Subject(s):
Math, Place Value, Number Sense and Operations, addition, subtraction, discussions, base ten
  50 minutes
basics
 
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